SMA PVO-N-20 - Manual (Page 7)

SMA Solar Technology AG 2 Safety
Installation Manual PVO-BOX-IA-en-10 7
2 Safety
2.1 Appropriate Usage
The SMA PV Offset Box applies a voltage against earth to PV modules and in this way dissipates any
power-reducing charges in the PV modules.
The SMA PV Offset Box is intended exclusively for in-parallel operation on inverters with a maximum
DC voltage of 400 V to 1,000 V.
Figure 1: Principle of a PV plant with SMA PV Offset Box and string inverter
The SMA PV Offset Box can be operated with both a string inverter and with an inverter with several
inputs. In an inverter with several inputs, the negative PV inputs must be internally bridged for this
purpose. This is the case with SMA multi-string inverters, providing that the DC switch-disconnector,
Electronic Solar Switch (ESS) is plugged in.